Cook noodles as directed on package, omitting salt.,Meanwhile, mix ricotta, shredded cheese, 3 Tbsp.,Parmesan and basil until blended.,Heat oil in large skillet on medium-high heat.,Add mushrooms; cook 4 min., stirring after 2 min.,Add garlic; cook 1 min.,or until garlic is fragrant and mushrooms are tender and browned, stirring frequently.,______,or until heated through, stirring frequently.,Remove from heat.,Add spinach; stir until spinach is wilted and evenly coated with sauce.,Spread 1/2 cup sauce onto bottom of 8-inch square microwaveable dish; top with 4 noodle pieces, half the cheese mixture and 1/3 cup of the remaining sauce.,Repeat layers.,Top with remaining noodles, sauce and Parmesan.,Microwave on HIGH 4 to 5 min.,or until heated through and bubbly around the edges.,Let stand 5 min.,before serving.